Adding direct access to DSP of sysmoBTS for PDTCH traffice

In order to use this feature, sysmoBTS requires option "-M", otherwise
the traffic is forwarded through socket interface.

This is essential, if PCU runs on processor of sysmoBTS. The reaction
time and delay of PDTCH frames could heavily degrade proper packet flow.
diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h
index 24a84e5..1d3fad9 100644
--- a/src/gprs_rlcmac.h
+++ b/src/gprs_rlcmac.h
@@ -58,6 +58,7 @@
 };
 
 struct gprs_rlcmac_trx {
+	void *fl1h;
 	uint16_t arfcn;
 	struct gprs_rlcmac_pdch pdch[8];
 	struct gprs_rlcmac_tbf *ul_tbf[32]; /* array of UL TBF, by UL TFI */
@@ -65,6 +66,7 @@
 };
 
 struct gprs_rlcmac_bts {
+	uint8_t bsic;
 	uint8_t fc_interval;
 	uint8_t cs1;
 	uint8_t cs2;